The electronic anti-lock braking system (ABS) regulates the braking pressure transmitted to the wheels, preventing a loss of grip in all tyre and road conditions.The system, managed by the braking control unit, has been designed to integrate and not replace the conventional mechanical braking system, thereby offering the driver an effective safety system in the case of problems: the intervention takes place using the same brake fluid as in the regular mechanical braking circuit.Four sensors, located on each of the four wheels, signal the speed of each wheel to the electronic control unit, recording any situations involving locking, slipping or loss of grip.When these situations do occur, the braking control unit operates the solenoid valves which have the function of modulating the pressure in the hydraulic circuit, preventing locking and restoring the vehicle to the grip limit conditions; in this way the least possible braking distance is required without losing control of the steering.The sensors are the active type, i.e. they consist of a receiver and the magnetic codifier integrated in the hub bearing: in these conditions the signal is not affected by any interference of a magnetic nature or related to the temperature.In addition, the control unit manages the distribution of the braking load on the rear axle, replacing the mechanical brake distributor used previously (EBD function: Electronic Brake Distribution ).The braking control unit which manages the system is equipped with an autodiagnostic function: the moment an error or failure is detected in the ABS function, the system is immediately deactivated and the warning light in the instrument panel comes on and a message is shown on the display. In these conditions the vehicle is braked using the regular braking system.If the control unit also detects an error in the EBD function, the ABS failure warning light comes on again plus the insufficient brake fluid level and handbrake warning light.The braking control unit calculates the speed of the vehicle starting from the figures that are supplied by the wheel sensors (with the control unit calculating the average value) and from the actual circumference of the wheels themselves, supplied by the Body Computer. this signal (speedometer signal) is then transmitted, via the CAN, to all the nodes that require this information for their functions.The braking control unit also produces a discreet signal which replicates the vehicle speed information calculated and transmitted via the CAN.The supply lines for the braking control unit are protected by two special maxifuses located inside the engine comparment junction unit; the supply controlled by the ignition (INT) comes from a specific fuse inside the dashboard control unit.